Sound-producing device.



No. $79,190. Mmmm? im., w. um. J. Y. NQRTHEY. SOUND PRQDUGING Umm.,

APPLIUATIH FILED DBG. 2. 1995.

JOHN PELL NOETHEY, OF TORONTO, ONTARIO, CANADA.

SOUND-PRODUCING DEVICE.

Specification of Letters Patent..

.Patented Feb. 1e, 190s.

Application 'led December 2, 1905. Serial No. 290037.

To 'all whom it may concern: Be it known thatI, JOHN Prem. Nonrnnr, ofthe city ol' Toronto, in the countyof York, in the Province of Ontario,Canada, lavcigi; vented certain new and useful Improvements inSound-ProducingDevices Suitable Jfor Sirens and Like Instruments, ofwhich the following is the specification. e

My 'invention relates to improvements in sound producing devicessuitable for sirens or like fog signaling or position locating der vicesof the character having a cylinder with sound producing oriiices and anannular enlargement and a cover, and also a reciprocating piston havingsound producing ori frees as shown for example in my Patent #736428 otAug. 18/03, and the object of. the

. present invention is to provide ia simple means for keeping separatethe sound producing air from the air which eiiects the reciprocationy ofthe piston whereby a Apurer note is produced and further to produce atthe end of each stroke 'of v'the piston, a cushioning eil'ect to limitthe stroke of the piston which objects are attained in the presentinstance by a particular arrangement of the ports and passages and byproviding separate inlets and outlets .for the sound producing air andfor the in'ipelling air, in a manner clearly set forth hereafter andillustrated in the accompanying drawings in whichr Figure l, is asectional elevation of a sound producing device or engine containing myimprovements. tional detail. Fig. 3, is a pers ective detail showing theform of the annu ar ports and their communication .with the openings orholes in the peripheryand face of the enlargement oi the cylinder.

In the drawings like letters of referenceindicate correspondingr partsin each figure?` A .1s a casing having an entrance Afor the soundproducmg air and the entrance A2 tpl' the irnpelling air.

` B is the cylinder having the annular enlargement B.

C is a piston having a head C and D is a cover, which is securely heldin the casing and abuts one end thereof' and the end or face of oriiicesB2, which are designed to c oa'ct with Fig. 2, Vis an enlarged secs theorifices C3 to produce thesound. The casing A is provided with anannular cham communicate. l kB'are apluralitygo radial holes extendingannular enlargement B` B3 are a series oi holes formed in the an nularenlargement parallel to the axis ofthe cylinder.

2 is an annular port located in the annular enlargement and,communicating with the mote from the end inner face of thelannularenlargements B.

3"is an annular `port in the annular en largement communicating with theholes B3. The annular port 3 is located at apoint slightly remote fromthe cover.

4 and 5 are annular orts in the internal periphery of the annu arenlargement B., such ports communicating with the holes B3.

.6 and 7 are ports in the piston head, the port 7 being outside of thehollow portion and the port 6 communicating with the intcrior. l

it will be noticed that the cover D is provided with an opening Dsurrounded at the interior by an inwardly extending flange D2 and itwill also be noted that the piston head C is provided with a flangedopening C4, which encircles the flange Dand has an easy i'it thereon.

The impelling air passes through the holes B'4 annular'ports 2 into theinterior of the cylinder, thereby driving the piston towards the cover,thence through the ports 7 a'nd 5 next the'cover where the force oi theair causes the piston to pass away from the "cover the port` 6 of thepiston comes opposite passes ont into the interior of the head of thepiston and throughthe opening D. thus he seen that the exhaust air issepa-` rated and diverted in my improvement away from'tle`soundproducing air, which. is anv im@` portant desideraturn, the object beingto obtain a pure note which will travel a much a note produced by airwith which the "exhaust ofthe impelling air was permitted "to mix, sincein the latter ease experiments show that the air waves would bedisturbed on account ofthe exhaust, opening at a dit ber A3 with whichthe entrance orifices A? lholes 'Bl and locatedet a point slightlyrecover. As the plston passes away from the the YYporte and consequentlythe exhaust inwardly from the external periphery lof the and holes B tothe annular port 3 to a point it will .v

greater distance than would be the case with Al sound producing devicefor sirens and like instruments'comprising acylinder with soundproduving orifices and an annular enfor the c xjlinder, and n re- Ilargement, a cover ciproeating piston hr1-ving sound producing' iorlhes, sind Cyhnder and piston having Cop- 5 @rating ports foradmitting and exhausting i the nir which effects the reciprocntion ofthe i piston, and means for separating: suid'ports froni the oriliceswhich admit the nir that I produces the sound whereby the lutter isunaffected in its quality, substantiall \v as deg scribed.

JOH\T PELL NORTIIEY.

Witnesses:

B. Born, E. MCEACHENN.

